Section 11-39-13 - Garage ventilation Ventilation for enclosed automobile parking garages shall be guided by the following:
(1) Each story or level of a parking garage shall be mechanically ventilated unless all of the following requirements are met: (A) More than half the wall area is open, in a wall length of at least (forty per cent) the perimeter;(B) There is no parking attendant or other employee normally working in the space; and(C) There is no such unusual or irregular shape of the story or level that the majority of the area would usually not receive natural air motion.(2) Mechanical ventilation for parking garages shall require a minimum of one and five tenths cfm per square foot (seven and five tenths liters per second per square metre) over the entire floor area requiring ventilation. At locations where traffic is such that congestion can occur, for example at an exit, the air distribution shall be adjusted to provide more air.(3) Ventilation may be by supply or exhaust, but shall be arranged for reasonably even air distribution.(4) An engineered system may be employed, using the equation: Q = Kn/C, where Q = exhaust ventilation rate, cfm; K = 1,380,000 (a constant); n = number of cars running at one instant; C = allowable carbon monoxide concentration, parts per million. For residential parking garages, n = 1.18 per cent of total parking spaces. For other parking garages, n may be higher. For engineered systems C shall be selected with regard to threshold limit CO and as approved by the director.[Eff. JAN 31, 1983] (Auth: HRS §§ 321-9, 321-11) (Imp: HRS §§ 321-1, 321-11)